Lining a metal butterfly valve with a thermoplastic material, typically a fluorocarbon, means that media does not come into contact with any metal parts. This is particularly useful where corrosive liquids are being handled ā for example, effluent, sludge or corrosive chemicals.
Thermoplastic liners are also chemically inert. This is useful where high purity media is required, for example in pharmaceutical and semiconductor high purity water applications.
Common valve lining materials
The main lining materials used for metal valves are:
- PTFE (PolyTetraFluoroEthylene)
- PFA (PerFluoroAlkoxy)
- TFMTM
PTFE liners are isostatically compression moulded from sintered chips. PFA linings are melt-processible which provides a far less permeable liner that can also be precisely moulded. TFMTM PTFE incorporates a PerflouroPropyl Vinyl Ether (PPVE) modifier to the PTFE. This is a more advanced material which has the following improvements to PTFE.
- Reduced cold flow by factor of 3
- Firmer polymer structure
- Less permeable (factor 2) for chemicals and gases
- Weldable
- Smoother surface for machining
- More transparent
- Injection mouldable in special cases
The advantages of PFA and TFMTM lined butterfly valves are that they:
- work well with most corrosive media to protect metal butterfly valve parts
- can outperform more expensive alloy valves
- are suitable for multiple-product processing lines being unaffected by media changes
- are seldom affected by process temperature variations
- are virtually impermeable
PFA and TFM Lined butterfly valves
GEMĆ 490 series lined metal butterfly valves are available with a moulded PFA or TFMTM body liners. These linings are achieved using the latest plastic injection moulding machines to form a precise lining locked to the valve body. This is integral to the valveās corrosion resistance.
Special silicon backing
As can be seen in Figure 1 the valve body liner is backed by a specially design silicon rubber backing which provides the forces needed for effective media sealing downstream.
Special shaft seal system
Chemical handling requires specialist sealing to prevent leaks to atmosphere. A special 4 fold shaft seal system (Figure 2) is also incorporated to prevent dangerous media leaks.
GEMĆ 490 series key features and benefits
- High performance PFA or TFMTM lined metal butterfly valve
- Wide range of sizes from DN40 to DN900 (1Ā½ā ā 36ā)
- PN3/10/16 bar media rated (depends on size)
- Suitable for use with temperatures up to +200 degrees Celsius
- Pneumatic, Motorised, Manual and bare shaft options
- Ideal for the distribution of Corrosive Chemicals, Effluents and Slurries
- The valve of choice for High Purity water applications in API Pharmaceuticals and Semiconductor plant
For more information on the GEMĆ 490 series, click on the visit website link or view the related entries below.
Snippet
Common lining materials for metal butterfly valves include PTFE and PFA. Find out why GEMĆ 490 series PFA lined butterfly valves out-perform PTFE linings in applications where corrosive media is being handled
Product info: (click to view)
GEMU Valves Ltd
- +441925824044
- customer.support@gemu.co.uk
- http://www.gemu.co.uk
- 10 Olympic Way Birchwood Warrington Cheshire WA2 0YL GB
About us
GEMĆ is a world leading manufacturer of valves, measurement and control systems for liquids, vapours and gases, especially when it comes to solutions for sterile applications. The GEMĆ Group currently employs over 1900 members of staff worldwide.
Manufacturing is carried out at six manufacturing sites across Germany, Switzerland, China, Brazil, France and the USA. The Group is active on all five continents with 27 subsidiaries and has a large distributor network in more than 50 countries
With the increasing requirements for process engineering, we offer a wide range of products providing solutions for a broad spectrum of customer groups, such as:
Specialising in all of the processes involved in the pharmaceutical, biotechnology, cosmetics, food and beverage industries. Application brochure: Solutions for the pharmaceutical, foodstuffs and biotechnology industries.
Specialising in industrial water treatment, chemicals, processing industry, surface finishing, power generation and environmental engineering. Application brochure: Solutions for industrial applications.
Focusing on valves for the production of semiconductors and microchips, photovoltaic systems and batteries,Ā and ultra-high-purity chemicals. Application brochure: Solutions for microelectronics, semiconductors and battery production.
- Service
Training courses for service and maintenance personnel, repair services and the commissioning of GEMĆ products directly at the customer's site.
GEMĆ GB isĀ based in Warrington providing product sales and technical support. Our product quality, application knowledge and broad range of services, make us a market leader in our field within the UK.
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Product Catalogue for the Pharmaceutical, Foodstuff and Biotechnology Industries
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Industries we supply to
Chemicals, Food and Beverage, Pharmaceutical Cosmetics Toiletries, Water and Wastewater
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GEMU Butterfly Valve Production Centre
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GEMĆ 490: Butterfly valve for controlling corrosive media
